Cut capsicum into 1 to 1.5-inch squares as tikka recipe typically uses large, chunky pieces, should be large enough to skewer onto sticks.
Likewise cut the onion as well.
Then cut the tofu into 1-inch squares (cubes) that are thick enough to hold their shape when skewered for tikka. Add thick yogurt (vegan), ginger garlic paste, red chilli powder, turmeric powder, roasted cumin powder, coriander powder, dry mango powder, chaat masala, garam masala, black pepper powder, black salt, salt to taste, juice of 1 lemon and mustard oil. Give them a good mix.
Add those capsicum, onion and tofu cubes.
Mix well so that everything coated so well.
Put in the refrigerator for 2 hours.
After 2 hours, time for arranging the veggies in skewers. Begin with a piece of capsicum (bell pepper), as it serves as a colorful base.
Next, add onion and thereafter tofu cube.
Continue the sequence - capsicum, onion, and tofu - alternating the pieces and finish with a piece of capsicum or onion, just like you started.
Arrange them on a baking tray.
Brush mustard oil over the veggies.
Place the tray in top rack of the preheated oven with only top rod and bake @230°C for 12-15 minutes.
Thereafter change the side of skewers, brush more oil on the other side as well.
Further bake for 5-7 minutes on same settings or until you got that charred marks on the tofu and veggies.
Take it out and serve hot by squeezing a lemon over it and a sprinkle of chaat masala.